Yamanouchi in collaboration with Protein Design Labs (PDL), is developing YM-337, a humanized antibody (C4G1) for the potential treatment of coronary artery disease, including myocardial infarction, arterial thrombosis and ischemic stroke. The antibody is based on a Yamanouchi murine antibody specific for the glycoprotein (GP) IIb/IIIa receptor found on human platelets 11942421. By June 1999, Yamanouchi was carrying out phase II trials on YM-337 in high-risk percutaneous transluminal coronary angioplasty (PTCA) patients in Europe and the US [326891]. These were ongoing in May 2001 [409092], [411763]. Phase II trials for the potential treatment of ischemic stroke were also underway by this time in Europe and the US [411763]. By 1998, Yamanouchi and PDL had an agreement for the development of a SMART C4G1. Yamanouchi holds exclusize worldwide rights to YM-337 and is responsible for all clinical trials and obtaining regulatory approval. As part of the collaboration, PDL has received milestone payments for humanization of the antibody and is entitled to receive royalties on product sales [274540].